Would "cone-tainers" work for vegetable starts?

[flowerweaver]

My seed starting supplies are pretty much 'gone with the wind' after the tornado this summer. I have landscape restoration friends who grow trees and grasses in Ray Leach "cone-tainers" because they accommodate/promote deep roots. The question is, do you think this would work for vegetables? I start tomatoes, peppers, eggplants, okra, winter greens, and other things in the greenhouse. If I don't the sprouts are eaten in the field by mice.

www.stuewe.com/products/rayleach.php

I've been eying them for a number of reasons:

They take up less footprint, being taller, yet hold the same cu. inches of soil.
You can remove the individual cells from the trays, which would be handy when wanting to separate things.
They are more sturdy than what I am replacing.
They sell a long-handled dibble with a foothold for planting starts that matches two of the popular size cells.

[steev]

I think wider would be better, taproots being less important on those veggies; further, the space needed for the cone-tainers may be less important than the space for the plant to expand.

I'm going to adopt that long, foot-driven dibble idea, though.

[philagardener]

Might be interesting to try for early carrots or parsnips . . .

[prairiegarden]

I would snaffle them if I were you. I was actually looking for those last spring but the only source I found was expensive so didn't go that route. The roots in my seedlings all dig down and then circle if I don't get them planted out at that point, so I don't see why the roots wouldn't be happy with deeper containers.

it might not be the roots but the above ground parts which had difficulty with air circulation, that was the only thing I was concerned about, but I'd certainly give it a go and see.

[walt]

I think deeper roots might be better for your situation.  
Peppers and okra have taproots if started in the ground.  These might save the taproot from stopping and growing side roots to the exclusion of the tap root.  The same might be true of other species you mentioned.

[prairiegarden]

There's a website that sells them that says most veggies do fine but don't use them for strawberries.